fpclassify(3) - NetBSD Manual Pages

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FPCLASSIFY(3)           NetBSD Library Functions Manual          FPCLASSIFY(3)


NAME

     fpclassify -- classify real floating type


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <math.h>

     int
     fpclassify(real-floating x);


DESCRIPTION

     The fpclassify() macro performs classification of its argument x.  An
     argument represented in a format wider than its semantic type is con-
     verted to its semantic type first.  The classification is then based on
     the type of the argument.

   IEEE 754
           FP_INFINITE      infinity, either positive or negative
           FP_NAN           not-a-number (``NaN'')
           FP_NORMAL        normal
           FP_SUBNORMAL     subnormal
           FP_ZERO          zero

   VAX
           FP_ROP           reserved operand (``ROP'')
           FP_DIRTYZERO     dirty zero
           FP_NORMAL        finite
           FP_ZERO          true zero


RETURN VALUES

     The fpclassify() macro returns the value of the number classification
     macro appropriate to its argument x as described above.


ERRORS

     No errors are defined.


SEE ALSO

     isfinite(3), isnormal(3), math(3), signbit(3)


STANDARDS

     The fpclassify() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

NetBSD 7.1                     January 14, 2004                     NetBSD 7.1